<?php
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+---------------------------------------------------------------------------
 */
namespace app\common\controller;
use think\Controller;
use think\Request;
use think\Session;
use think\Cookie;
use think\Hook;
abstract class Oauth {

  /**
   * oauth版本
   * @var string
   */
  protected $Version = '2.0';

  /**
   * 申请应用时分配的app_key
   * @var string
   */
  protected $AppKey = '';

  /**
   * 申请应用时分配的 app_secret
   * @var string
   */
  protected $AppSecret = '';

  /**
   * 授权类型 response_type 目前只能为code
   * @var string
   */
  protected $ResponseType = 'code';

  /**
   * grant_type 目前只能为 authorization_code
   * @var string 
   */
  protected $GrantType = 'authorization_code';

  /**
   * 回调页面URL  可以通过配置文件配置
   * @var string
   */
  protected $Callback = '';

  /**
   * 获取request_code的额外参数 URL查询字符串格式
   * @var srting
   */
  protected $Authorize = '';

  /**
   * 获取request_code请求的URL
   * @var string
   */
  protected $GetRequestCodeURL = '';

  /**
   * 获取access_token请求的URL
   * @var string
   */
  protected $GetAccessTokenURL = '';

  /**
   * API根路径
   * @var string
   */
  protected $ApiBase = '';

  /**
   * 授权后获取到的TOKEN信息
   * @var array
   */
  protected $Token = null;

  /**
   * 调用接口类型
   * @var string
   */
  private $Type = '';

  /**
   * 构造方法，配置应用信息
   * @param array $token 
   */
  public function __construct($token = null) {
    //设置SDK类型
    $class = get_class($this);
    $this->Type = strtoupper(array_pop(explode('\\', substr($class, 0, strlen($class) - 3))));

    //获取应用配置
    $config = C("THINK_SDK_{$this->Type}");

    if (empty($config['APP_KEY']) || empty($config['APP_SECRET'])) {
      E('请配置您申请的APP_KEY和APP_SECRET');
    } else {
      $this->AppKey = $config['APP_KEY'];
      $this->AppSecret = $config['APP_SECRET'];
      $this->Token = $token; //设置获取到的TOKEN
    }
  }

  /**
   * 取得Oauth实例
   * @static
   * @return mixed 返回Oauth
   */
  public static function getInstance($type, $token = null) {
    $name = "\\Common\\Lib\Api\\sdk\\" . ucfirst(strtolower($type)) . 'SDK';
    if (class_exists($name)) {
      return new $name($token);
    } else {
      E(L('_CLASS_NOT_EXIST_') . ':' . $name);
    }
  }

  /**
   * 初始化配置
   */
  private function config() {
    $config = C("THINK_SDK_{$this->Type}");
    if (!empty($config['AUTHORIZE'])) {
      $this->Authorize = $config['AUTHORIZE'];
    }
    if (!empty($config['CALLBACK'])) {
      $this->Callback = $config['CALLBACK'];
    } else {
      E('请配置回调页面地址');
    }
  }

  /**
   * 请求code 
   */
  public function getRequestCodeURL() {
    $this->config();
    //Oauth 标准参数
    $params = array(
      'client_id'    => $this->AppKey,
      'redirect_uri'   => $this->Callback,
      'response_type'  => $this->ResponseType,
    );

    //获取额外参数
    if ($this->Authorize) {
      parse_str($this->Authorize, $_param);
      if (is_array($_param)) {
        $params = array_merge($params, $_param);
      } else {
        E('AUTHORIZE配置不正确！');
      }
    }
    return $this->GetRequestCodeURL . '?' . http_build_query($params);
  }

  /**
   * 获取access_token
   * @param string $code 上一步请求到的code
   */
  public function getAccessToken($code, $extend = null) {
    $this->config();
    $params = array(
      'client_id'    => $this->AppKey,
      'client_secret'  => $this->AppSecret,
      'grant_type'   => $this->GrantType,
      'code'       => $code,
      'redirect_uri'   => $this->Callback,
    );
    // show($this->GetAccessTokenURL);
    // die;
    $data = $this->http($this->GetAccessTokenURL, $params, 'POST');
    $this->Token = $this->parseToken($data, $extend);
    return $this->Token;
  }

  /**
   * 合并默认参数和额外参数
   * @param array $params  默认参数
   * @param array/string $param 额外参数
   * @return array:
   */
  protected function param($params, $param) {
    if (is_string($param)) {
      parse_str($param, $param);
    }
    return array_merge($params, $param);
  }

  /**
   * 获取指定API请求的URL
   * @param  string $api API名称
   * @param  string $fix api后缀
   * @return string      请求的完整URL
   */
  protected function url($api, $fix = '') {
    return $this->ApiBase . $api . $fix;
  }

  /**
   * 发送HTTP请求方法，目前只支持CURL发送请求
   * @param  string $url    请求URL
   * @param  array  $params 请求参数
   * @param  string $method 请求方法GET/POST
   * @return array  $data   响应数据
   */
  protected function http($url, $params, $method = 'GET', $header = array(), $multi = false) {
    $opts = array(
      CURLOPT_TIMEOUT      => 30,
      CURLOPT_RETURNTRANSFER   => 1,
      CURLOPT_SSL_VERIFYPEER   => false,
      CURLOPT_SSL_VERIFYHOST   => false,
      CURLOPT_HTTPHEADER     => $header
    );

    /* 根据请求类型设置特定参数 */
    switch (strtoupper($method)) {
      case 'GET':
        $opts[CURLOPT_URL] = $url . '?' . http_build_query($params);
        break;
      case 'POST':
        //判断是否传输文件
        $params = $multi ? $params : http_build_query($params);
        $opts[CURLOPT_URL] = $url;
        $opts[CURLOPT_POST] = 1;
        $opts[CURLOPT_POSTFIELDS] = $params;
        break;
      default:
        E('不支持的请求方式！');
    }

    /* 初始化并执行curl请求 */
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
    curl_setopt_array($ch, $opts);
    $data = curl_exec($ch);
    $error = curl_error($ch);
    curl_close($ch);
    if ($error) {
      E('请求发生错误：' . $error);
    }
    return $data;
  }

  /**
   * 抽象方法，在SNSSDK中实现
   * 组装接口调用参数 并调用接口
   */
  abstract protected function call($api, $param = '', $method = 'GET', $multi = false);

  /**
   * 抽象方法，在SNSSDK中实现
   * 解析access_token方法请求后的返回值
   */
  abstract protected function parseToken($result, $extend);

  /**
   * 抽象方法，在SNSSDK中实现
   * 获取当前授权用户的SNS标识
   */
  abstract public function openid();
}
